Hi Maryanna,
Please keep in mind the terms you are choosing to use to describe these techniques. Terms describing Japanese works of art often have secondary meanings in today's industries and crafts. In particular, enamel in this context should be used to describe a hard , vitreous substance created by melting powdered glass in a kiln, to create the surface in cloisonne, for instance. A modern useage applies it to a paint which dries to a hard, glossy appearance. Also, lacquer - thought now used for any number of durable, glossy finishes, in a Japanese sense refers to 'urushi'- the sap of a plant which hardens (I'm using very brief definitions

)
With regards to this piece, I may stand corrected, but I doubt it was created to give the impression of cloissonne (Jp- shippo). It's my understanding that shippo has never be considered a high craft in Japan. Though it has been and is made at the studio-craft level (and can be gorgeous), it has also been mass produced in spite of the fairly laborious steps required. It seems strange to me that a mass produced craft would be imitated still further. Also, shippo, generally does not have so much 'busy-ness' and density of line in its imagery. If you look at this piece, it's basically a complex line drawing similar to a Western printed etching or engraving.
The imperfections of line in your up-close images especially the 8th one (notice how the motives inside the boxes look blurred and sloppy, and the right angles are not crisp, but rounded) is what leads me to believe that the acid-resist may have been generated by a photographic process. This is in keeping with an early 20th century date as well. At any rate, the design wasn't directly hand generated.
Finally, a dead giveaway for this being Export is the subject matter- It's got it all

dragons, waves, clouds, pagodas, pines, cherry blossoms, stone lanterns, Mt. Fuji, peonies.
Regards,
Doug