i've heard that the balkans i a good source for chemically patinated bronze mace and axe head repros. most 'roman' bronze items on epray seem to come from there. i bought an 'ancient roman mace head' for about £30, cleaned the green goop off with salt & vinagar, polished it and it made a neat walking stick knob handle. i bought a socketed bronze 'roman' axe head for about the same, it also made a nice walking stick. i left it green. both came from romania &were brand new under the green. found a company that made exact castings of real artifacts, warts, pits, broken bits & all, and fairly cheap. wrote them to ask if they' make me an unbroken unpitted casting. they never replied.
anyhow modern bronzes have a differing copper/tin ratio and some use a dab of aluminum in the mix, phosphorus is also used. a mettalergical analysis might show the mix is modern or not. i doubt the forgers are duplicating exactly the old mix (i hear some had lead &or zinc in as well as tin). you can download a PDF document on the metallurgy of ancient bronze
HERE
'ancient' roman bronze mace head walking stick. - top
'anchient roman socket axe' walking stick/fokos. - bottom -it's nice & sharp
too
mace head below -after cleaning & before.
bronze axe head used on the walking stick.