This appears to be a #10 Royal Typewriter with a single see thru window. The version with double see thru side panel windows was introduced in 1914 and the single window version a short time after. The object of the windows was to allow viewing of the inner mechanism.

Condition: Good

Logos: Good with some wear.

Nickel Plating: Needs conditioning.

Condition of platen: Very Good. Minimal wear

Condition of Keys: All working with one needing adjustment.

Missing: Beveled glass side panel, right turning knob, disconnected carriage string, ribbon not available.

Mechanism: Platen turns freely, carriage moves freely, keys all strike, carriage bell in working order, tab setters are present, paper guide attached. Would benefit from cleaning and conditioning.