Hi Fernando,
age would be difficult, but likely late 19th C to early-mid 20th C. It is a 'self bow' (made from a single piece of wood) , had been been laminated or composite it would be easier to date due to the construction technique and materials.
I do not think the 47 refers to the draw weight. Usually the draw weight is set at a certain 'draw length'. For instance 35lbs at 28"... this means that when the bow is drawn 28" (from the bow to the string) it requires a force of 35lbs. If the same bow is drawn back 29" the amount of force required would be greater than 35lbs, probably something like 39lbs.
Kind Regards David
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