Very nice. Thats an UZO Uberwasserzeiloptik.
Excellent photo groupings also. Hold on to them.
My grandfather FW Willi Hundertmark sent the war years with the Luftwaffe flying Aufklarer as radio operator/navigator .
He never made any notes on his 12 wartime photo albums, which annoyed me. After he died they were given to a private museum at Kiel-Holtenau.
Then the guy running it died and his wife sold everything off. Now there's nothing left.
Regards,
Chris