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I'm not sure what you are getting at. Right side receiver markings in the Imperial period are inspector stamps of one kind or another and left side markings are SNs with or without suffixes and model designations in either Fraktur or Roman font and specific pressure proofs. Other incidental receiver markings may be dates of manufacture/rehab (e.g., 1914, 1914/17 etc.) Are you suggesting attempting quantifying these combinations (good luck!) or simply listing them?