I have this lamp and don't know model. I find all picture, this lamp haven't pressure gauge but my lamp have it. The gauge is mark "Blanchard lamp" Thank you for your answer
Welcome aboard! That's an excellent find and it's model number is 900 and the link below shows a 1923 advert which shows that lamp, but it's only open to subscribers, pressure gauges may have been optional, Jeff. http://0flo.com/index.php?threads/6459