Not a model 10 but it is a "Military and Police".
It is a model 58 .41 magnum my dad bought back on Dec. 27, 1964
for a total cost of $62.16.
My dad always felt the 38 special was lacking as a duty weapon,
and tried to convince the powers that be that there were better alternatives.
The Assistant Chief and an "expert" deemed the magnum .41 too much to handle for most of the officers,
but my dad was welcome to attend the Captain's meeting to further discuss the pros on cons of the .41 magnum.
Dad explained that he wasn't necessarily lobbying for the .41 magnum, and that
the .357 magnum would be a good alternative as the more skilled officers could use
.357 magnum loads, and the less skilled could opt for 38 special loads.
After the meeting all of the Captains recommended getting the Combat Masterpiece
in .357 magnum and stop the purchase of the Model 10HB. Of course the Assist. Chief
had the last word and he went ahead with his choice of the Model 10HB with
Western 38 Special Super Police 200 grain Lubaloy ammo.
Some years later they were issued .357's, first the Model 66's, and then those were traded for 681's.