I recently purchased R.R.P. Roseville Ohio Bowls and mixing bowls. Would a stamped piece be more valuable then if it’s in Embossed on the bottom? The pieces I purchased are all embossed. Some are embossed shallow and some deeper. Some are glazed over and some are not. One thing I did notice is the letterings on the ones that are shallow have an older looking font. I am also wondering if I can actually eat from these bowls and can I put them through the dishwasher, or are they only for decoration if they are truly vintage.