Please help me identify this R&D spoon and unusual knife

Please can you help me identify this set of Roberts and Dore spoons and unusual knife? I can’t work out what the knife is used for. Also, any dates would be interesting too.
R&Dset3.jpg
R&Dset2.jpg
R&Dset1.jpg

I would guess it’s a Grapefuit Set, (curved knife for loosening, & pointed spoons for the segments).
Apart from that, the marks indicate electroplate nicket silver, and I would suggest of little commercial value.
‘R&D’? no idea … but other here may have a better idea.
Best regards,
John

Thank you- a grapefruit set does make sense. I’m guessing the R&D is Robert & Dore, but I’m not sure of the year.

Roberts & Dore is probably correct, from the last quarter of the 20th would be my guess.
Regards
John