Hi Denny,
The caliber marking is .38 S & W CTG
The cylinder is stamped with a crown as well as the butt of the grip with the following: C v B p
The article on page 104 of the November issue of American Rifleman is very interesting regarding these pistols.
The American issued Navy and Marine Corps pilots model, the article says, were marked with ".38 S. & W. Special CTG". The rest were Lend Lease revolvers however the article says that they will also "usually be found with U.S. Property markings", which this specimen does not have. The article says some will differ.
I also have a Garand with a build date of 9/41 that has no U.S. Property markings on it, just the usual Springrield marks and then the British proof on the bolt with the date.
The seller apologized profusely and shrugged "If it didn't have those import marks on it, it would be worth a lot more. I'll let you have it for $700.00."
That is a $5,000.00 rifle, unmolested and TE of 1.0. My best Garand purchase ever.
Mark