The RL-7 is an early LED indicator produced by Litronix. In construction this device appears similar to the Monsanto MV1 or MV2, though the die is noticeably brighter. This device also has a significant reduction in gold content: the metal can of the MV1 has been replaced by a shallow metal base. The RL-7 is rated for approximately 1.5mcd of light output, which makes it usable as an indicator, though its light output is easily rendered undetectable in a well lit room. The frosted epoxy construction makes this a much more usable indicator than the MV1, though it unfortunately prevents any microscopic examination of the die. The RL-7 is believed to have been released sometime prior to 1974.
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