here's what i learned.
Here's what I have on the GP100's and SP101's that were built for them, from the reference:
KGPFNY-831 and KGPFNY-841 double-action only (spurless hammer) with dull finish and all-rubber grip. Known s/n range 172-08467 to 172-44934 (KGPFNY-831) and 172-31506 to 172-98145 (KGPFNY-841). "GPNY" is rollmarked on one side of the cylinder frame. A total of at least 2,561 of both models were purchased by the New York City Police Department. Both are extremely scarce.
KGPFNY-841 with regular production brushed stainless finish, a spur hammer and goncalo alves grip inserts. "GPNY" is rollmarked on one side of the cylinder frame. Known s/n range 172-98117 to 173-01535. These are an overrun of the New York City Police Department contract. Probably not over 500 produced.
KSPNY-182 New York City Police Department contract with target gray finish (all should have the short cylinder frame). Known s/n range 570-20269 to 570-47403. Rollmarked with "SPNY" on the side of the cylinder frame. "RUGER SP101" is not marked on the barrel. Probably not more than 3,000 produced. Rare.
KSPNY-182 New York City Police Department contract with brushed stainless finish. Known s/n 570-46737. Rollmarked with "SPNY" on the side of the cylinder frame. "RUGER SP101" is not marked on the barrel. Unknown quantity produced. This is probably a manufacturing overrun of the variation noted in the paragraph above. Extremely rare.
As to the Security-Six/Service-Six/Speed-Six series', Ruger did make a few of these for NY also, as follows:
GF-84NYCPD double action only (with bobbed hammer) Known s/n range 162-40766 to 162-41689. 4 known. Extremely rare. At least one of this variety is known to have been shipped with a shipping sleeve that has a shipping sleeve stamp that incorrectly states “GF-84” and “SPEED-SIX” (known s/n 162-41689). Note that this model also has a star hand stamped on the inside of the crane, possibly by an armorer outside the Ruger factory.
GS-83NYCPD double action only (no full cock notch on bobbed hammer). Known s/n’s 162-40935, 162-41364, 162-42413 and 162-42614. Only four known, extremely rare. Note that this model also has a star hand stamped on the inside of the crane, possibly by an armorer outside the Ruger factory.
Note that some of the guns in these contracts that are marked "SERVICE-SIX" on the side of the frame may have actually had their butt rounded into the Speed-Six configuration and shipped as the GS-83NYCPD model. These are very interesting hybrids, made to use up Ruger's leftover stock of the old "SIX" series because of the impending GP100 arrival.
(credit to Chet15 ruger forum member)
Very nice find. Did you call Ruger to verify if was a NYCPD and request a free letter? If not you can call them at 603-865-2424
(ruger forum member rimfired)
uh oh wifey calling more later,
Regards,
Rich