The F300s represent an era during which Omega was struggling to adopt to the changing watch markets. New technologies that offered great accuracy were being developed and, like most other watch companies, Omega was trying to incorporate these into their lines. In the case of the f300s these were watches with tuning fork mechanisms that were originally developed by Max Hertzel for the Bulova watch Co. Subsequently these movements were produced by ESA (Ebauche Societe Anonyme) and licensed by Omega. The Seamasters f300 above were at the top of the line of the f300 models and housed an Omega 1250 movement (ESA 9162). They cam out in 1972 and offered a limited number of dial options and bracelet combinations. See above are the 198.0005 (black dial) with an integrated bracelet and the 198.0016 (silver dial) which is the less common variant, allowing the use of a strap/bracelet with spring bars. These have gained popularity over the past few years and prices have been going up steadily. The most important tip regarding these is to purchase an example in working condition, as many of the parts are no longer available and if a replacement of an index wheel or date ring is required, the repair will cost a pretty penny.