It has no markings save for some notes written inside on the metal backing. Looks like maintenance would write the date they replaced the bulb.
The glass is in great shape with white raised letters on a red background. The metal mounting plate looks to have been converted to use a more modern light bulb at some point as you will see in the pictures. I do not know if it works.I thought it was pretty cool and I saved it from being thrown out. The item "VINTAGE CURVED GLASS EXIT SIGN PULLED FROM OLD CHURCH RARE" is in sale since Thursday, November 22, 2018. This item is in the category "Antiques\Architectural & Garden\Signs & Plaques". The seller is "toncannizz-0" and is located in River Grove, Illinois. This item can be shipped to United States.