Antique Vintage Waterman's Ideal Regus Pat Off Fountain Pen

Description

Antique Vintage Waterman's Ideal Regus Pat Off Fountain Pen in very good condition with normal wear.
The nib engraved with "WATERMAN'S, REG U.S., PAT. OFF, 2".
The barrel engraved with "
WATERMAN'S, IDEAL, REG U.S., PAT. OFF".
Also marked on the end of the barrel, “52 1/2 V” (model = 5, nib size number = 2, short “vest” size (“V”), slim diameter with chain loop (“1/2”).
Made in USA.
The sac need to be replaced.
Engraved "HFL" on the cap.
Thanks for looking.