I found a Lyman scope in a box labeled "Lyman 439 Field". I can't find anything online other than a Lyman 438 Field. The one in the box has two non adjustable mounts but I didn't know to look for a model number on the scope itself and its 100 miles from home. Everything I find has the "Lyman 438 Field" scope with an adjustable rear mount or an optional micrometer "click" mount.
Can anyone verify that there is actually a Lyman 439?

Thanks,Don