Hi Evgeny,
Wolfrum's book ("Unbekannte Pflicht" by 296 Verlag) lists this victory as follows:
#17 - Jak-1 - 02.11.43 - PQ 1332
FYI, #16 was achieved on 22.10.43, and #18 was on 06.11.43.
Unfortunately, Wolfrum doesn't provide any details in the narrative about his 17th, 18th and 19th victories. No details about his aircraft either, except for the action on 22.10.43, when his 109 was severely damaged by two heavy-caliber shells (one in the wing and one in the fuselage behind him.) It somehow held together and he was able to fly it back to base at Ursin and make a successful belly-landing.
Hope that helps,
Leon Venter