3x antique spoons, signs of age as shown in photos.

Silver plate mark reads A, 👑, prime, shield with a cross and MP with a 👑 above.

From a little research I found that

A = standard quality

👑 = Birmingham

Prime = Thomas Prime and Sons

Shield with cross (I couldn't find a reference for that)

And MP =Magneto Plate the technique used for applying the silver plate.

The Thomas Prime factory closed in the year 1900 and the silver plate mark was banned in 1894 so from what I can make out they date between 1850 to 1894.