These family crests (In Japanese, KAMON) are called 'Rengyo - Mon' in JAPAN.
|Ogimachi Forsythia||Saga Forsythia(3)||Saga Forsythia(2)||Saga Forsythia(1)||Saga Forsythia||Shimabara Forsythia|
Saga Forsythia (2)(3) designs are referred to the ones that have been engraved on the cufflinks.
It has been provided image from Mr. Motosane.
Thanks to Mr. Motosane