Many years ago after I finished my man cave two car garage I bought this vintage dual parking meter . Just thought it would be a cool exterior decoration with one head for each bay

. The research via Mr. Google says it was made by M.H. Rhodes Inc somewhere between the 1930's and 1950's . The style is called " Mark Time " . It works with pennies and nickels .
Unfortunately both glass pieces are missing

. I haven't been able to find any via internet searches . Does anyone here have knowledge of parking meters ? If I can't find true replacements I think the next option would be cutting/shaping some thin plexiglass . The meter heads have grooves in them where the glass originally slid into . I have no clue how the glass was retained .
Anyone have any suggestions ? I also need to unlock this to get to the post retention bolt and flange . Plus I want to get the money out that's rattling around inside

. Get a locksmith to do it ? I am not looking to restore it I think it has great patina as is . But I don't want rain water getting inside .