I've seen a couple pumas where the following appears to be true, and in one case is stated as follows:

This razor is very nice and in mint condition, never been used or sharpend, the blade is hollow ground on one side and flat ground on the other side The Puma emblem is metal inlayed in the handle. The blade is 3 1/8" long and the razor opened is 9 7/8" long, closed 6 1/4".
Does that make any sense? - a razor being hollow ground on one side and flat ground on the other? Here's the listing, but there are two like this right now.

Puma Razor Vintage KNIFE~HUNTING~KNIVES~ - eBay (item 280297991494 end time Jan-04-09 16:41:08 PST)