I have read through a lot of the old S&W publications and the Military and Police term has been used for both the .38 caliber and 32. caliber guns. Attached is a scan of a paragaph from page 143 of Roper's book,
Experiments of a Handgunner and hopefully images of 2 .32 WCF HE's from my collection.
The 4" nickel is 91555 and the 6" blue is 108534. Both have non medallion checked stocks. The 4" stocks are numbered to the gun but I see no markings on the 6" gun stocks.
