The Jasper furniture factory closed in 2003 I believe.
The 3 ply have an inner layer of American Sweetgum Liquidambar styraciflua and the 6ply have layers of same in between. I've checked it out first hand. Gretsch switched from 3ply to 6ply in 1958 and added silver sealer at that time.
I recently bought a neglected 58 Gretsch 4pc - 1420,812,1414 & 5.514 - in Gold Sparkle for under $1,000 Cdn with hardware and cymbals thrown in. I found out shortly after I bought them one of the cymbals is probably worth a lot more than I paid for the drums. The kit needed lots of work to restore but I'm happy to say the finish is in great shape - it was mostly dirt & grime on the shells & hardware.
My main point here is regarding what people (some people will pay for something like this). Yesterday for instance I received an email from the Canadian Gretsch drum rep. in answer to a question about the finish. My question was answered and then added this:
"By the way, I saw a 60's kit exactly the same as this in mint condition going for $13,000 (which is totally ridiculous) and the buyer's were lining up cheque-book in hand!"
That was a shocker for me. I had no idea! My drums aren't in "mint" condition, but still........
they're in very good to excellent condition....I'm not selling though - at any price. Because you just spend the money and then you don't have your dream drums (mine are these) and the money's gone....
Gary