How to make Embossed watch caseback?

for example, Seiko Dive watch series. SKX007, they have a big wave on caseback to tell it is for Diving Watch.

or Omega Seamaster series, also have a hippocampus, head in horse shape and bottom with fish body. a shark, a big fish or Nessie. they design some symbols for brands. it seems every brand treats the dive watch series specially, even in Rolex, Sea Dweller with engraved caseback too (it is different as other series in blank caseback).

and that the subtle changes throughout the years tell the history of the particular watch brand, solid caseback engravings hold more personal stories and celebrate the owners` of the watch. such as Rolex, they keep caseback in blank for consumer's customization. it is unusual in watch field. Most watch brands like us, there are some info at caseback by laser, like material, movement, glass, or series number and so on.

At old time, it was hand-engraved for letters or patterns on caseback. with industrial development for decades, there are more efficient and economic ways to make it. like embossed pattern, we make a mold for it then use the machine to punch from mold to get the blank, then doing other process in details to make it perfect caseback. etching, brushing, polishing or laser the letters for more watch info. we have skilled-workers and new machine for more 3D pattern on caseback. like below. in this case, it is very important to make a good mold for it. like below. it is much easier than old time engraved by hand or hand tools, isn't it? you hardly see the difference. and industrial goods are more suitable for bulk quantity.