Valuation for Insurance on Omega

If it's a model still available, then a print out from an Irish dealers website for the model, showing the price, should be enough for your insurance. What the insurance company is looking for is the cost to replace the item with the same or nearest item, where the owner makes no financial gain throught the insurance claim.

If it's an older model, then you could do the same with a web search, making sure to adjust for taxes if the one you find is outside of the EU.

If your watch has a serial number, then take note of it, too. Ideally photograph the watch from all angles, as this will show any marks and scratches which may become identifying features if the watch is stolen and recovered.

The original supplier of your watch may well already have a record of your watch from when you bought it, and, depending on their policy, may send you an updated valuation at no cost. It would be no harm to ring them and ask.