From what I can see in the photo the suffix is an "O". As Mike pointed out, it is a fairly common Alphabet Commercial gun that has been heavily buffed and reblued.
It is not unusual for family "lore" to embellish an heirloom over the years. The "Germany" stamp indicates that this gun was sold into the US, so it is highly unlikely that this was taken off a German officer. Being a commercial and not a military gun would tend to reenforce this.
It is what it is, a nice shooter passed down from your Granpa to you. Treasure it as a family heirloom.
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