Good day .
Your opinion about the authenticity ?
14×9 cm

On the Soviet postcard,signed left.What is Lagorio)

Of course - not "Soviet". Iosif Iosifovich Submissive died in 1914...
But not Lagorio, alas...

Fully agree, that this is not Lev Feliksovich. And that postcard is not Soviet.
The inscription on the card doesn't match the time. Let's start with the fact that the text on the reverse side of the postcard, signed the year 1895. And on the front under the alleged autograph Lagorio is 96 a year. The second blooper is enclosed in the dividing strip. On the postcard are shown on the Central vertical line dividing the field cards for addresses and messages. Split the address side of postcards appeared in Russia and France in 1904. Here is samples of postcards before and after 1904.