Hello and welcome! My name is Doris.I have been an antiques collector, dealer and appraiser for over 56 years.I will be pleased to help you.
Are there any first initials to Harner?
Could the name be one of these:
The only artist that fits both the spelling and the dating of 1883 is Alois Harner, also known as Aloys Harner, a last half of the 19thC Austrian.
Your oil painting, as described with no picture, would have an estimated retail value of $500-900 as a decorative piece. This value assumes good condition and depends on sale geographic location.
As for where to sell close to retail, I suggest these sites where you have the widest pool of buyers -
Accept PayPal only.
Etsy.com - small fees - 20 cents to list plus 3.5% final price.Artfire.comBonanza.com
In general, a private seller to a dealer, via consignment or at auction can expect 30-50% of estimated retail value.
Insurance replacement values are usually about 10% more than retail values.
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I forgot to mention that Munich (Munchen) is near the Austrian border. It therefore would have been a large city that the Austrian artist community would have frequented.