I have 1 and I purchased it about 20 yrs ago from a Phillips executive in Bartlesville ,he said that not many were made and they were given to top oil distributors ,its NOS had the original box and will try to find, on the wooden base green lens side a brass plaque with 1927-1928, orange side brass plaque with 1930-1959. call 910 6703335 if interested Mike

mona mike