These are called'Yodahead' style tuners. Bridge is floating and is original and in perfect shape.AS in tailpiece and tortoise shell faux pick guard nice and heavy duty. The dark line on the TOP wood is NOT a crack in the wood.
It looks like discoloration in the finish bubbled up at one time long ago. So its probably oxidized varnish.I looked under magnifying glass and the wood to my surprised is not cracked. No cracks or damage anywhere to the wood body on this guitar. Made in New York USA I believe it's a 1951. Beautiful THICK heavy solid top carved body. The item "1951 Vintage Epiphone ZENITH Sunburst Archtop Acoustic Guitar Made USA CarvedTop" is in sale since Thursday, December 5, 2019.
This item is in the category "Musical Instruments & Gear\Guitars & Basses\Acoustic Guitars". The seller is "55live" and is located in Johnston, Rhode Island. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, China, Sweden, South Korea, Indonesia, Taiwan, South africa, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Bahamas, Israel, Mexico, New Zealand, Singapore, Switzerland, Norway, Saudi arabia, Ukraine, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Chile, Colombia, Panama, Jamaica, Barbados, Bangladesh, Bermuda, Brunei darussalam, Bolivia, Egypt, Guadeloupe, Iceland, Jordan, Cayman islands, Sri lanka, Luxembourg, Maldives, Nicaragua, Oman, Pakistan, Paraguay, Reunion, Uruguay.