While I am wanting to discuss the specific question of long frame production post-WW1, there is another interesting aspect of this pistol I'll bring up.
The pistol is embellished with the Swiss "Cross in Sunburst" over its receiver.
I find this very curious because in 1907 the Army had specified that DWM contract pistols should be embellished with the "Cross in Shield" device. See Gortz & Sturgess, Vol. II, pages 645-646.
Of course, this applied only to the military contracts, but you would think it reflected Swiss sensibilities generally.
Why did DWM revert to the earlier "Cross in Sunburst" device?
So many questions! But please don't be diverted from the original discussion of frame length.
Curl