I recently acquired first issue DWM #7383 "a" unit marked: 20.R.M.G.55. The "R" is not script, the "55" smaller numbers. On page 123 of Jan's Imperial Lugers, this could signify "20th Infantry Regiment, Machine Gun Company #55", or "20th Reserve Infantry Regiment, Machine Gun Company, weapon #55". But on page 128 is pictured a similar 1st issue, with "6.R.M.G.47". So could mine mean "20th Grenadier Regiment, Machine Gun Company, weapon #55"? I suppose knowledge of the existence of such units would be of extreme help here but would appreciate opinions. Would anyone know the history of the regiment depicted? I'm still trying to obtain Jeff Noll's book.