With the inner, outer boxes, guarantee, instructions and even the hang tag this Seamaster f300 is an unusual full set.  Model reference ST398.0821.


From the serial number on the movement we can accurately date this watch to being made in 1972.  However the sales papers, which have the same serial number, show it was sold in December 1976.  Either year is valid for a birth year watch.


Having such a complete set for a watch of this age is unusual, but you should never be sidetracked by the accessories and always focus on the watch itself first and foremost.  Happily it is all good news there too – the blue dial may have some light fading but it is original.  The calibre 1250 movement was developed with use of some of the Bulova patents, as is recognised inside the case back – Bulova were the leaders in the tuning fork technology, so it makes sense to use their designs rather than start from scratch.  The f300 moniker signifies that the watch hums at a frequency of 300hZ, whereas almost all mechanical watches run between 2.5 and 5 hZ.  This is why the f300 has such a smooth sweep seconds hand.  We will install a brand new battery before sending the watch out to the new owner.  Neither case not bracelet have been polished, so will show some marks.  The worst is probably a scratch on the crown side of the case, but you can’t feel it with your fingernail so it isn’t deep.  The bracelet, with the clasp numbered 1198/195, is quite long and our sister website, SpareLinks.com, may have extra links if required.

This watch will be supplied with the original presentation boxes, papers, hangtag and our Certificate of Authenticity.

Please see the HD video for more detail.  All photos and videos are part of the description and are of the actual watch unless mentioned.  We do not photoshop any pictures, and the images are copyright of birthyearwatches.com and should not be used without permission.


Width with crown  40.8 mm

Width without crown  38.3 mm

Between lugs  10 mm

Lug to lug length  43.4 mm

Case Thickness  11.0 mm

Bracelet will fit a maximum wrist size of 190 mm.  The bracelet can be sized for you if you give us your wrist size when placing the order.

All sizes are approximate.  The watch is photographed on a wrist of 190mm/7.5 inches.

Included with this watch is a 3 month guarantee and free delivery to UK addresses.  If you live outside the UK we can still deliver to most countries.  Please see our Worldwide Shipping information, or Contact Us.   Payment can be made by most credit or debit cards, bank transfer or PayPal.

From 1st September 2021 we will be planting a tree for every watch we sell, working with the International Tree Foundation (Est 1922) to make this business positive on carbon.  By buying anything pre owned you are effectively reusing what already exists, but this takes it further and makes us feel good.