Roy,

Here is the best guide we have to molds. Robert has put a lot of work into the site. Many of us have helped with what we know at this time.

http://www.antiquegamblingchips.com/molddesignindex_site.htm

I have chips from the 30's on the X mold.
I doubt the Avenue chip is from the 30's. More likely 40's maybe early 50's.
At this time we don't even know if the X mold was a Burt chip or a USPC chip. I think Blanchard will answer that question when his book comes out later this year. Hopefully it will be a Burt chip and hopefully it will be a distributor chip and not an open mold.

Nice chip, if you have a trader, I am interested.