Nice Winchester Straight Razor~ No. 8528~ Fancy Handle - eBay (item 110435726007 end time Sep-23-09 18:58:21 PDT)
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Looks like celluloid to me. I have one with genuine tortoise and the only way I know that is because it tends to delaminate along the edges. It is cut into thin strips and laminated with heat and pressure when they fabricate it into shapes.
Yea I thought so myself but that 4th picture really makes it look like aged tortoise shell.
http://imgur.com/u0Nvn.jpg
It looks like plastic made to look like turtleshell
But looks can be deceiving!
Celluloid, but a very nice tortoise shell pattern. Wish I had a Winchester razor! (tears drip on the keyboard...sniff) Congratulations on finding a pretty rare blade.