From: doug
Email: alwaysup@att.net
Every photograph I have ever seen of this calculator shows an ivory colored or off-white case. With a yellow function key and red clear key. I have a unit that has a black case and all black keys. The color of the key descriptions are silver with a few that are a mustard yellow color. The only id information I have found is stamped on the bottom of the unit: (((U541))) I have looked and never been able to find any information as to when any were produced in black. Any help would be appreciated.
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