Welcome, 2652 is the model reference, 354 is the movement calibre
http://www.omegawatches.com/planet-omega/heritage/vintage-watches-database?ref=15130
1st generation Constellation, also called "arrowhead" after the index shape
Since you were offered scrap gold price assume there is a hallmark, should be on the watch and bracelet (by clasp)
Guess there may be some members here who might be interested but you can find a range by searching sold auctions on ebay
Edited by a mod Apr 9, 2015