Ithaca Model 37 Serial Numbers

drcook

.270 WIN
Posts: 293
Joined: Sun Nov 25, 2012 8:44 am
Posted: Thu Sep 19, 2013 8:58 am
Does anyone know the exact gunsmith process of fitting a barrel to an older model 37?

See below
Is it just a head space thing, or is there serious barrel smiting involved?

See below, needs machined on a lathe
Is it possible to have a barrel that is fitted to another gun fit on yours with no problem?

About the same odds as hitting the lottery
Can I just head space a barrel myself and if it checks out, is it okay to use or is there something I'm missing something?

Missing something
My local gun guy might know someone with an ICYL barrel for my pump and I wanna jump on it if possible and I am wondering exactly what my shotgun will have to go through to get it working properly.

Keep in mind that it will cost at least 100.00 to have a barrel fitted. That translates into shipping both ways, 75.00 that Les says he charges, I do not know the local rate here by me.
He says that pre-855,000 guns are interchangeable with other pre-855,000 guns based on how old your barrel and shotgun are, but I have heard this is false from a variety of forum members and old timers at the gun club. Is there any truth in what he says or has he been miss-informed?

He is smoking crack. Just kidding, he had it turned around.
The newer POST 855,000 barrels are interchangeable.
The older barrel threads (pre-855,000) had a pitch to the threads, just like on a bolt. There is a dimensional relationship between the barrel face, the shoulder at the end of the threads, the face of the receiver and an internal shoulder.
This is why the barrels are serial nbr'ed to the receiver. There will be a serial nbr on the front face of the receiver, running vertically next to where the barrel goes in, and the serial nbr on the barrel that also has a - (dash nbr) to indicate choke. Such as 543123-2 indicates a MOD choked barrel.
Ithaca choke marking system: '1' for Improved Cylinder; '2' for Modified; '3' for Improved Modified and '4' for Full choke. There were also Skt marked barrels (or maybe nbr 5)
In order to fit the barrels (from what I can tell by observation and talking to other folks) the barrels were screwed into the receivers and a 'witness mark' put on them. If you look at the older barrels most if not all will have the witness mark. All of mine do (older ones). The witness mark allowed them to align the barrel in fixtures to cut the thread interrupts, the extractor cuts and to put the barrel lug on.
Most pre- barrels will not even start. You can fudge them by backing them out a little but then they won't headspace correctly. If they do start, they will usually stop before going into position.
Because the threads have a 'pitch' to them, the barrel is actually pulled into the receiver a small amount, just like a bolt is pulled into a nut/threaded hole when turned. A 1/4 turn does not translate into much movement, but it is there and has to be taken into account.
To fit a barrel, the barrel face and the shoulder have to be carefully machined on a lathe a little at a time until the barrel will go into the receiver, start into the threads and then when turned, bottom out with the all the aforementioned features in alignment. A person has to understand the dimensional relationship before hacking away at the metal.
As I posted, there are 2 gunsmiths that I know of that I would trust to fit the barrels. Other good gunsmiths if they take the time to understand the dimension relationships could do them also, but they have to take the time to look at the design.
The post 855,000 barrels simply use parallel V grooves, which allows barrels to be swapped back and forth. Sometimes due to pre-CNC machining practices/tolerances, even those might need a little adjustment.
Here is a chart I recovered from the old Ithaca website.

Model 37 2500 Series Centennial Model 37 Presentation Series Centennial Hi-Grade Ithaca Model 37 Guns Model 37 Law Enforcement Weapons ITHACA MODEL 87 REPEATER Model 87 Basic—1989-1994 Model 87 Magnum Model 87 Field Grade—1987-1990 Model 87 Camo—1987-1994 Model. This one's 9.I think It's an Ithaca Model 37-Featherlight. Serial# 371414XXX If the '37' denotes the model.fabulous. But then it's still a 7 digit number. If the '1' stands for. That being said, he states with no apparent ambiguity that the last pistol manufactured was serial number 2660318. He also states the assigned range for Ithaca went up to 2693613, as others have stated. This is probably a gun to avoid, particularly as a first M1911A1. 20 gauge ithaca model 37 deerslayer iii ga 26in rifled barrel in box: used: ithaca model 37 12ga deerslayer rifled barrel pump shotgun 20 inch: used: 12 ga ithaca featherlight model 37 pump action shotgun pistol grip wow 18 inch barrel: used: ithaca 37 deerslayer 12ga 24 rifled bore parkerized synthetic ca ok inch barrel: used.

Ithaca Model 37 Repeater Serial Number Listing by Year.
Year All Model Guns
Model1937 1 to 3,500
1938 to 10,000
1939 to 18,350
Ithaca Model 37 Serial Numbers1940 to 34,400
Standard Model Solid Rib * Skeet* Trap*
1941 to 50,900 70,000-71,500 80,000-80,400 88,000-88,150
1942 to 62,900 71,501-72,199 80,401-80,899
WWII
1946 62,901 to 69,999 72,200-73,150 80,900-81,899 88,150-88,300 90,000-115,350
1947 to 157,150 73,150-74,700 81,900-82,499 88,300-88,760
1948 to 202,950 74,701-78,300 82,500-83,414 89,065-89,619
1949 to 302,500 78,301-79,999 83,415-83,964 89,620-89,969
Special serial number sequence for Solid Rib guns discontinued
310,000-310,099
1950 to 348,000 83,965-83,999 310,100-310,179

Ithaca Model 37 Serial Numbers And Year Made

1951 to 413,000 84,000-84,169 310,180-310,404
1952 to 504,000 84,170-84,189 310,405-310,429
1953 to 544,000 84,190-84,399 310,430-310,619 509,600-509,649 509,650-509,699
All Model Guns 37-S discontinued after 1953
Special serial number sequence for 37-T guns discontinued
1954 to 574,000 ......1971 to 371,211,500
1955 to 602,000 ......1972 to 371,275,000
1956 to 652,000 ......1973 to 371,339,000 381,000,001-381,030,000
1957 to 704,000 ......1974 to 371,405,500
1958 to 727,000 ......1975 to 371,517,500
1959 to 759,000 ......1976 to 371,596,000
1960 to 777,000 ......1977 to 371,626,000
1961 to 797,000 ......1978 to 371,648,000
1962 to 820,000 ......1979 to 371,678,000
1963 to 867,000 ......1980 to 371,709,000
1964 to 891,000 ......1981 to 371,728,100

Ithaca Model 37 Slam Fire Serial Numbers


1965 to 927,000 .......1982 to 371,758,700

Ithaca Model 37 Serial Numbers

1966 to 966,000 .......1983 to 371,850,800
1967 to 999,500 ........1984 to 371,871,500
1968 to 1,042,000 ......1985 to 371,882,000
1969 to 371,091,500 ...1986 to 371,889,000
1970 to 371,150,500
source: Ithaca Gun Company, LLC 2003