This is how yorkies looked like about 200 years ago:
http://chestofbooks.com/animals/dogs...C-S-B-7822.jpg
Sooo, your yorkie is propably a yorkie !
About 150-300 years ago the silky terrier didnt exist, the yorkshire terrier then and the silky terrier today looked almost alike ! the Yorkie had much longer nose, its color was maybe darker or lighter than todays yorkie, they were much much bigger (from 6-13 kilo's), with longer bodys and shorter legs.
The Yorkshire Terrier and the Australian Terrier were mixed together to create the Australian Silky Terrier, and today the Yorkie has changed so much its almost just some other breed now than 200-300 years ago, they have much shorter backs, longer legs, shorter noses, they are much much smaller in size and often not as muscular.
My neighbour owns a yorkie from the old british yorkie lines, she's very big (5-6 kilo's), almost all just cream colored nothing steelblue on her or gray, she has long pointy nose , short legs and long back, and is VERY muscular, almost like a whippet ! That kind of yorkies should have been still breed today they are sooo beautiful and perfect working dogs, my neighbours dog kills rabbits all the time ! and she gets crazy if she see's a cat then she's going to kill it, she's a hunting dog in her soul haha
Fun to say but the yorkie on the picture i put in is Fido's relative
.... so cool !