This is a very distinctive piece decorated with great confidence and artistic skill. The fantasy butterflies and peaches were a popular decorative theme of the 1920s
and 1930s when I would estimate it was made. Indeed the shape ~an ovoid jar
which originally would have had a lid something like these ones have:
http://p2.la-img.com/686/28792/11086919_1_x.jpg

and the red Qianlong seal marks all point towards the early Chinese Republic (early 1900s). The decoration was done in a Qianlong style, called fencai or
famille rose a style that had its roots in ancient Chinese cloisonné enamel, which is lots of tiny blobs of colored glass enamel held in place by a framework of wire that outlined the shapes of the drawing, not unlike the lead in a stained glass window.

The porcelain enamel on your piece, however, would have been a thickish paste, painted on by hand, that would have stayed where it was placed, or contained by the slightly indented black lines, however the decorative forms remained very similar to cloisonné. Lots of carefully delineated leaves and scattered flower blossoms, fruit sprays, and of course those wonderful butterflies. The turquoise ground was painstakingly
applied afterward by filling in the white 'negative space' between the details
of the pattern, quite a skillful thing to do.

These jars -sometimes called ginger jars- were originally used for the custom of exchanging new year's gifts. The gift would be placed inside and the jar returned afterward. (An admirable form of packaging recycling, and the very first cookie jars as the gift was often something sweet and edible.)

So as to price, if you were to see yours for sale in an antique store, even without the lid, it would have a retail value of $250. This is also the replacement value and what you should insure it for.

Expect to get about 40% to 50% of this if you were to sell at auction or on-line

I do hope this helps!

Please let me know if I can be of further assistance,

Best wishes,

Robert