My grandfather and another family member each bought a guitar back in the mid 1970's. One purchased an Ibanez guitar and the other a Mansfield and I now am the owner of both guitars. These two guitars look exactly identical, same color, fret board, inlays, pick guard, everything. The only difference is that one has Ibanez written on it and the other has Mansfield so yes they were made by the same people at the time and both guitars sound almost exactly the same. Hope this answers your question :)
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Mansfield???NEW by: Graham
There must be a large number of luthiers of whom I've never heard, and with whose products I am not familiar. This is one of them.
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Story of Mansfield GuitarsNEW by: Guitar Guru
I have limited information on Mansfield Guitars. My understanding is that Mansfield Guitars produced in the 1970s were actually made by Hoshino Gakki (Japan), the Ibanez makers. And, that the guitars made during this era are high quality - even collector items.
I encourage others to comment to help answer this question!