No one knows. Depending on who you believe the Rosicrucians either faded away around the turn of the 20th century (some sources say earlier) or they went so deeply underground that you will never find them again. Also there have, over the last couple hundred years or so, been a few dozen rosicrucian groups, all of which had their own sets of symbols, passwords and grips, of which no written record has ever surfaced.
Its entirely possible that the grips, like with the Masons, are not only decided by the lodge but change from time to time. So, there's probably never been one single grip.
Rosicrucian Digest was created in 1915.
Rosicrucian Fellowship was created in 1909.
The Rosicrucian Cosmo-Conception was created in 1909.
He use a semi western grip for forehand and for his backhand he use continental grip (right hand), eastern grip (left hand)
Rosicrucian Order Crotona Fellowship was created in 1924.
Some products are out there such as "Prohands by Gripmaster", the "Harbinger Adjustable Hand Grip", "Go Fit Adjustable Hand Grip". "Atlus Pro Hand Grip" and many other brands. The products tend to be the same, being items where you squeeze the handles together.
That is the correct spelling of grip (a briefcase, a handhold, or a hand's hold).
There is no one classification of normal for grip strength. Factors vary depending on size of hand and strength of hand.
When this grip is used on it's own it is called the gable grip.
hand shake
handle
grip or cling