Antique Rare Oversized German Drgm Alpacca Mutli-color Mechanical Pencil

This rare German mechanical pencil is in very good condition and great working order. Sliding buttons slide easily as intended. Still has the 3 color cartridges(?) intact. Hard to find exactly when this was made (1900-1940).
• Maxi oversize mechanical pencil with 3 colors
• Material: Alpacca - nickel silver = copper - nickel - zinc alloy
• Enamelled sliding buttons sliders Red, Blue, Black
• D.R.G.M. = German Reichs utility model
• Length of the pencil approx 6-1/2”
• Diameter approx 0.58”
• Weight approx 55 g
Please look closely at all the pictures and feel free to ask questions before purchasing.
Thanks for looking