Search engine is designed to look for a specific item so the results depend on the search words you use

For exmple if you search for

Vintage Seiko 5 - you have one listing on page 1 and the other on page 2

If you search for

Vintage Seiko 5 Sports - you have on item on third position and second on sixth

The only way buyer will find the item is if the buyer is looking for the exact item you sell.

If buyer will search for vintage seiko the result will be 1132 listing so yours will be somewhere on page 10 or something