There's some sidewalk work in an older part of town and I hit it with the CZ-20 on two days this weekend. Used the F70 there also. The CZ 20 is my first choice for these sites, it's simply quiter and deeper in that environment. Simple formula, if the sidewalks are up and I'm working the gravel/cinder ash underneath, use the CZ. If I'm working the parkways both prior to and after a scrape/turn I use the F70. Almost all of the iron stuff, hitching posts, watch parts and crotal bell came out by the CZ-20 including the small lapel pin. Most all of the coinage came out with the F70, though the CZ still got a lot of the cent coins. A nearby park offered up good digs at the end of each day's sidewalk hunts with a '86 IH, wheaties including 1912, '35, and several '40's cents.
My buddy had his ETrac and I totally outscored him on coins, something like 14 quarters to 3, Mems and clad dimes in similar ratios. One Saca. He got the best with a '43 Walker and a '43 George. So yeah, even though I dug more, still didn't get the coil in the right place at the right time for the silver this time but I got some great old goodies all the same.
My buddy had his ETrac and I totally outscored him on coins, something like 14 quarters to 3, Mems and clad dimes in similar ratios. One Saca. He got the best with a '43 Walker and a '43 George. So yeah, even though I dug more, still didn't get the coil in the right place at the right time for the silver this time but I got some great old goodies all the same.