Hi OF For sale we have a few Omega Speedmaster case backs. Ready for replacements, upgrades, mods, or to have just-in-case. All thread on as they should, all are OEM Omega parts. 1- SOLD Standard Professional case back, C6 pre-hologram, type used on 1995-2006ish models. Used, has light scratches from case opening. $150 SOLD 2- Standard Professional case back, C6 with hologram, type used on 2007ish-2017 Speedmasters. Looks unused in open original package. $250 3- Case Back for 3594.50 / 3894.50 the Limited Production "Replica" 145.0222. Looks unused, probably lightly used. $175 4- Current Service case back for Speedmaster Mark II, 145.0014. Yes, it says Seamaster, yes it says 145.0014, yes it is correct....why does it say Seamaster when it is for a Speedmaster? Ask Omega ... Very light scratches, $150 5- SOLD Sapphire Sandwich case back, D6, "The First And Only" used for 2002-2016 models. Very good condition, lightly used, no scratches to crystal or major blemishes to speak of. Pretty sure these are exchange only now from Omega so harder and harder to find. $495 SOLD Ask for more pictures as needed for any/all. All prices are net to me, shipping is included for the USA, ask for a quote for international but assume +$30. Wise or PayPal F&F are the preferred payment methods. I will always listen to reasonable offers and am willing to do bundle deals on multiple items, from multiple posts. Thanks OF for the space, and thanks to members who read the FS posts! (Next, dials and hands!)