Schugart's price guide lists the originally highest cost big 18 size 23 jewel version cheaper than 17j. Also $4000. for one with the $10. wind indicator option. Apparently rarity is the major factor in that good reference; not including gold cases. Apparently there were few original buyers for the cheap indicator. So a fine r.r. 23j Vanguard will be $400. or less, when a 17j may be $700. from same seller, or with winding indicator $4000. Opportunity then for a good buy with the 17j. My examples here are in ornate 14k and plain 18k hunting cases thus negating the movement value advantage of the 17j. I think the Schugart reference is a good one for relative values. Difficult to be exact with up to date prevailing values. 17j left.