Ad blocker detected: Our website is made possible by displaying online advertisements to our visitors. Please consider supporting us by disabling your ad blocker on our website.
I can't make out the first mark, but the others are:
S/ACH: Assay master's mark for 1768, Aachen, Gemany.
Eagle: City mark for Aachen, Germany
JC (monogram), crowned: Maker's mark of Johann Theodor Cremer (also Cremers), working in Aachen 1753-1793; died 1794. Several liturgical works by him are known in Germany & Belgium, including ciboria, crucifixes, chalices and reliquaries.