Bang on with the date... Oyster is a great bracelet...and since it's got lugholes () swapping between an Oyster, Jubilee, and croc strap is no problem at all!
5506 is nice and the 1530s (indeed, most of the 15xx series) is/are great movements. Pricing on these is somewhat higher than a comparable vintage Omega Constellation (and, quite honestly, I love the 564 movement- in house Omega ) but, I agree, still reasonable- especially in this market (I picked this up for a song).