well I guessed 20 years old...it is actually 30 years old.
the PT is 070-3 - argon.. to me it looks up to air - I'll bet it is dead.
it may have been sent back in 2004 and a quote given to repair it and customer decided HELL NO and it was crated back up and sent back.
if you shoot me pics of the pt i will nail it down 80% for you.
but what ya got there is a laser with great potential...all you need is a PT
Pat B
laserman532 on ebay
Been there, done that, got the t-shirt & selling it in a garage sale.