Not wanting to crash the party - I am not a luthier - but I collect info about them assuming that if someone finds a guitar without providence they ask 2 questions:
What is it?
When was it made?
There is obviously a 3rd question - how much is it worth - but that is not so important to me.
The following questions are directed to Frank (but am happy that any luthier responds as I am trying to document this info for as many as possible).
I have collected some info for Gryphon at:
http://www.jedistar.com/jedistar_vintage_guitar_dating_g.htm
and would be keen for an answer to question 3 below:
1. When did you start making under that brand name.
2. Where made?
3. How do you tell date of making
4. A photo of the date mark would be icing on the cake.
Regards
paul