hi Smuder
I think you will find the larger of the duo is also a Seaforth Highlanders, but the officers pattern. There is a pair on
www.qmsmilitaria.com item 59828 but now sold. Worn with the F cypher as a two part collar badge. There is also a single one still for sale, type in 'Seaforth Officer' into the search bar and they should all appear.
Kind regards
The Quartermaster